1. Clustering phenomena in atoms and nuclei. Brenner, M. (ed.). Berlin, Heidelberg, New York: Springer 1992
2. Proceedings of the fifth ISSPIC, University of Konstanz 1990: Z. Phys. D19; Z. Phys. D20 (1991)
3. Bohr, A., Mottelson, B.: Nuclear structure, Vol. II, New York: Benjamin 1975
4. Ekardt, W.: Phys. Rev. Lett.52, 1925 (1984)
5. Bréchignac, C., Cahuzac, Ph., Carlier, F., de Frutos, M.: Phys. Rev. Lett.64, 2893 (1990)